I'm thinking of buying one of these for my bathroom but this particular
version isn't a stock item at my local builders merchant so would have
to be ordered. I've been on the domus web-site and can't find the info
I'm looking for. Is anyone here familiar with these ? I'd like to
know how the Humidistat sensor and the Pull-switch interact with each
other. i.e. if the humidistat has kicked in, can I over-ride it with
the switch to turn the fan off? Conversely, can I start the fan
manually even when the humidistat hasn't kicked in?

Also, is the switch built into the fan housing or is it physically
separate ? I want to install it in the wall rather than in the ceiling
and this obviously wouldn't work if the switch was built into the fan
housing.

Finally, regardless of the specific fan in use, should it be part of
the earth-bonding circuit in the bathroom?